Roll



C. BERLOW Dec. 19, 1933.

ROLL

Filed Dec. 14. 1931 2 Sheets-Sheet l "gif C. B-ERLOW Dec. 19, 1933.

ROLL

Filed Dec. 14, 1931 2 Sheets-Sheet 2 WHW Patented Dec. 19, 1933 UNITED STATES PATENT OFFICE ROLL Application December 14, 1931 Serial No. 580,918

19 Claims.

My invention relates to improvements in rolls and particularly to the construction of a roll especially adapted for use in paper making machines and in its method of manufacture.

I have found out in practice that rubber on rolls for use in paper making machinery whether they be the table rolls or otherwise does not wear as quickly as brass or other metal and that the water present in said machines acts as lubricant for the rubber and prevents it from wearing so quickly. My invention, however, while particularly adapted for paper making machinery may be employed on any type of a roll which is desired to wear a long time in use and be of relatively light weight.

While I am aware that others have stated that it is desirable to vulcanize rubber to wood so far as I am aware I am the first to actually do this and provide a rubber roll on which the rubber is completely vulcanized and aflixed to its wooden core without having any disintegrating effects on the wood. For this purpose I employ rubber cement provided with an ultra low temperature accelerator and then apply an outer covering over said rubber cement and vulcanize it to the wooden core at such a low temperature as to have no disintegrating effects upon the Wood. I ilnd the attachment of the rubber covering to the wood is much aided if an intermediate layer of semi-hard foundation stock also provided with an ultra accelerator is employed.

These and such other objects of my invention as may hereinafter appear will be best understood from a description of the accompanying drawings which illustrate an embodiment thereof.

In the drawings, Fig. 1 is a side elevation of a portion of a paper making machine provided with table rolls embodying my present invention.

Fig. 2 is a perspective view of the completed roll.

Fig. 3 is a sectional view through the completed roll.

Figs. 4-'1 illustrate various steps of my novel method of manufacturing such a roll, Fig. 4 being a perspective view of the wooden core, Fig. 5 being a sectional view of said wooden core after my improved rubber cement layer has been attached thereto, Fig. 6 being a sectional view after the intermediate layer of foundation stock has been attached thereto and Fig. 7 being a view after the rubber covering has been attached thereto prior to vulcanization into the roll shown in Fig. 3.

Fig. 8 is an enlarged sectional View of a. portion of the periphery of my improved roll.

In the drawings, wherein like characters of reference indicate like parts throughout, 10 generally indicates a roll constructed in accordance with the principles of my invention, including a wooden body portion 12 having an outer cover- 60 ing 14 of rubber preferably of soft rubber vulcanized thereto. While my improved roll may be employed in any place where it is desired to have a roll having a light body and a rubber exterior which may come in contact with other rolls 55 of iron, wood, metal, rubber, etc. or particularly with wire in the presence of a liquid, as the liquid acts as a lubricant for the rubber and prevents its wear while contacting the wire, my improved roll is particularly adapted for use on m a paper making machine of the Fourdrinier variety having a table 11 on which a breast roll (not shown) and the table rollers 13 are mounted over which passes the wire. The, rolls are preferably constructed as shown in Figs. 3-7 in which 75 12 is the cylindrical portion having an exterior surface of wood and 14 is a shell or covering of rubber, preferably a soft rubber. Such a roll will be very light because of the wooden body and will also be very durable because rubber wears in contact with metallic surfaces much less than other metals and will not'be aifected by any hemicals which would tend to cause deterioraion.

While I am aware that others have attempted 95 to vulcanize rubber to wood, so far as I am aware I have never hitherto known of such an article, nor have been aware of its actually having been done, and I believe I am therefore the first to provide a roll having a wooden core with 90 a rubber covering vulcanized thereto without any disintegrating effects upon the wood. I therefore take the wooden core 12 shown in Fig. 4, cover it as shown in Fig. 5 with a layer of rubber cement 18 provided with an ultra accel- 95 erator. While any suitable type of ultra or low temperature accelerator may be employed, I preferably employ tetramethylthiurandisulphide, although it is obvious that other well known i types of ultra accelerators may be employed. In the actual practice I preferably construct .the rubber layer as follows: 84 units of solvent oil,

20 units of rubber, 691/2 units of filler, 9% units of ,sulphur and accelerator suitably mixed together. I then cover said rubber cement layer 18 with an intermediate layer of soft foundation stock 20 also having an ultra accelerator therein. As stated I preferably employ as the ultra accelerator tetramethylthiurandisulphide, although it is obvious that other types of low temperature accelerators may be employed. In my preferred embodiment I employ a foundation stock made up as follows; 20 units of rubber, 691/2 units of filler, 11% units of sulphur and accelerator suitably mixed together to make up the layer of soft foundation stock 20 over the rubber layer. I then as shown in Fig. 7 take a sheet of soft rubber 22 and wrap it completely around the layer of foundation stock. I then suitably vulcanize my improved roll at a temperature so slow that it has no substantial charring or disintegrating effect on the Wood. Employing the ultra accelerator in actual practice I only leave this in the vulcanizer a relatively short period of time, such as two hours and maintain the temperature substantially near 250 F. and I have found that this temperature for this length of time has no appreciable disintegrating effect on the wood, although it is obvious that it may be vulcanized with the use of ultra accelerators at a lower temperature over a longer period of time. It is obvious that the seam 24 between the abutting ends of the outer soft layer 22 will disappear as the abutting edges will become united during vulcanization, that the rubber cement layer 18 will sink into the pores of the wood and will become vulcanized and firmly afxed thereto, the intermediate layer 20 of foundation stock will become vulcanized to the rubber cement and to the outer covering 14, and the outer covering 14 will become vulcanized to the layer of foundation stock and to its abutting edges so as to form the completed roll shown in perspective in Fig. 2 and in section in Fig. 3. In the claims I employ Wood in its natural state as wood which has not been disintegrated in any manner, such as by charring or splitting up thereof. It is thus apparent that I have provided not only a novel type of roll, for use in any type of machinery, wherever desired, but also a novel method of its manufacture.

It is understood that my invention is not limited to the specific embodiment shown and that various deviations may be made therefrom without departing from the spirit and scope ofthe appended claims.

What I claim is:

1. A roll having a wooden body portion in its natural state and a protective rubber covering vulcanized' thereto at a temperature below the charring point of wood.

2. A roll having a wooden body portion to its natural state and a' soft protective rubber covering vulcanized thereto at a temperature belowy the charring point of Wood with a binder comprising a layer of rubber cement impregnated Within the outer wooden pores and a layer of foundation stock under said covering.

3. A roll having a wooden body portion in its natural state and a protective rubber covering vulcanized thereto at a temperature below the charringv point of wood with a binder comprising a layer of rubber cement impregnated within the outer Wooden pores and a layer of foundation stock under said covering.

4. A roll having a wooden body portion inv its natural state and a soft protective rubber covering vulcanized thereto at a temperature below the charring point of wood with a binder comprisinga layer of rubber cement impregnated within the outer wooden pores. Y

5. A roll having a wooden body portion in its natural state and a protective rubber covering vulcanized thereto at a temperature below the charring point of wood with a binder comprising a layer of rubber cement impregnated within the outer wooden pores.

6. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, covering said layer with an intermediate layer of soft foundation stock having an ultra accelerator, wrapping a thin sheet of soft rubber over said intermediate layer and vulcanizing said rubber material into a homogeneous unit at such a temperature that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating effect on the wood.

7. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, covering said layer with an intermediate layer of soft foundation stock having an ultra accelerator, wrapping a sheet of rubber over said intermediate layer and vulcanizing said rubber material into a homogeneous unit at such a temperature that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores Without any disintegrating effect on the wood.

8. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, wrapping a thin sheet of rubber thereover and vulcanizing said rubber ma.- terial into a homogeneous unit at such a temperature that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into saidA pores without any disintegrating effect on the wood.

9. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, wrapping a sheet of rubber thereon and vulcanizing said rubber material into a homogeneous unit at such a temperature that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating effect on the wood.

10. A paper making machine having rolls for the wire, having their body portions made of wood and their cylindrical exterior surfaces made of rubber vulcanized to said wood.

11. A roll having a Wooden body portion in its 130 natural state and a protective rubber covering vulcanized thereto at a temperature below 257 F.

12. A roll having a wooden body portion to its natural state and a soft protective rubber covering vulcanized thereto at a temperature below 257 F. 135 with a binder comprising a layer of rubber cement impregnated within the outer wooden pores and a layer of foundation stock under said covering.

13. A roll having a wooden body portion in its natural state and a protective rubber covering 140 vulcanized thereto at a temperature below 257 F. with a binder comprising a layer of rubber cement impregnated within the outer wooden pores and a layer of foundation stock under said covering.

14. A roll having a wooden body portion in its 145 natural state and a soft protective rubber covering vulcanized thereto at a temperature below 257 F. with a binder comprising a layer of rubber cement impregnated within the outer wooden pores.

15, A roll having a wooden body portion in its 150 natural state and a protective rubber covering vulcanized thereto at a temperature below 257 F. with a binder comprising a layer of rubber cement impregnated within the outer wooden pores.

16. The method of securing a rubber covering to a wooden core which comprises covering said cover with a layer of rubber cement having an ultra accelerator, covering said layer with an intermediate layer of soft foundation stock having an ultra accelerator, wrapping a thin sheet of soft rubber over said intermediate layer and vulcanizing said rubber material into a homogeneous unit at such a temperature below 257 F. that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating efiect on the wood.

17. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, covering said layer with an intermediate layer of soft foundation stock having an ultra accelerator, wrapping a sheet of rubber over said intermediate layer and vulcanizing said rubber material into a homogeneous unit at such a temperature below 257 F. that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating eiect on the wood.

18. The method of securing a rubber covering to a wooden core which comprises covering said core with a' layer of rubber cement having an ultra accelerator, wrapping a thin sheet of rubber thereover and vulcanizing said rubber materiai into a homogeneous unit at such a temperature below 257 F. that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating effect on the wood.

19. The method of securing a rubber covering to a wooden core which comprises covering said core with a layer of rubber cement having an ultra accelerator, wrapping a sheet of rubber thereof and vulcanizing said rubber material into a homogeneous unit at such a temperature below 257 F. that the rubber cement becomes locked within the outer pores of the wooden core and the rubber covering contracts to push the cement into said pores without any disintegrating effect on the wood.

CHARLES BERLOW. 

